# cronmon - Cron e-mail filtering and management
# Copyright (c) 2010 Crown copyright
# 
# This file is part of cronmon.
# 
# cronmon is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# 
# cronmon is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with cronmon.  If not, see <http://www.gnu.org/licenses/>.

from django.template import Library

register = Library()

@register.filter
def lines(str):
    return str.count('\n') + 1


@register.filter
def truncatelines(s, length=50):
    idx = 0
    i = 0
    while i < length:
        end = s.find('\n', idx)
        if end == -1:
            return s
        idx = end + 1
        i += 1
    return s[:idx]
